220 WEST : NOTES ON THE FRESH-WATER ALG. 
Navicula amphisbzena Bory. Waghen; Beverley; Loftsome 
Bridge near Wressle. 
Navicula sphzrophora Kiitz. Near Meaux Abbey; Beverley. 
Navicula pusilla Sm. Tickton; Routh; Beverley ; near Meaux 
Abbey ; Waghen. 
\ avicula anglica Ralfs. Loftsome Bridge, near Wressle. 
Navicula rhynchocephala Kiitz. Beverley; Loftsome Bridge, 
near Wressle ; Waghen ; Tickton ; near Meaux Abbey. 
Navicula Dirhynchus Ehrnb. Near Sutton; Routh; Beverley. 
Navicula Amphirhynchus Ehrnb. Beverley. 
Navicula producta Sm. Loftsome Bridge, near Wressle. 
Navicula appendiculata Kiitz. forma exilis Grun. Newsholme. 
Navicula exilis (Kiitz.) Grun. Near Meaux Abbey ; Beverley ; 
Routh; Waghen ; Tickton; Loftsome Bridge, near Wressle ; 
Newsholme. 
Navicula angustata Sm. Near Meaux Abbey; Newsholme; 
Waghen ; Beverley ; Tickton. 
Navicula cryptocephala Kiitz. Tickton ; Waghen. 
Navicula veneta Kiitz. Newsholme. 
Navicula dicephala Ehrnb. Near Meaux Abbey ; Beverley ; 
Routh ; Waghen ; Tickton. 
Pinauiar nobilis Ehrnb. Beverley. 
Pinnularia viridis (Ehrnb.) Rabh. Beverley ; Loftsome Bridge, 
near Wressle; near Meaux Abbey; Tickton; near Sutton; 
- Newsholme. 
Pinnularia peregrina Ehrnb. Tickton. 
Pinnularia radiosa (Kiitz.) Rabh. Beverley ; Riccall Common ; 
Tickton ; near Meaux Abbey ; Routh ; Waghen. 
Pinnularia radios (Kiitz.) Rabh. var. silesiaca (Bleisch) Rabb. s 
Beverley. 
Pinnularia viridula (Kiitz.) Rabh. Tickton. 
Pinnularia mesolepta Sm. Tickton ; Beverley ; near ‘Meaux ae 
Abbey. 
Pinnularia Brebissonii (Kiitz.)) Rabh.  Tickton; Beverley , eo 
near Meaux Abbey. 
Frustulia saxonica Rabh. forma aquatica Rabh. Beverley; 
Waghen. 
Pleurosigma attenuatum (Kiitz.) Sm. Breet: 3 
Pleurosigma lacustre Sm. Hornsea Mere; Tickton; Loftsome 
maaie near eee Beverley ; Waghen ; Newsholme. — 
